CN105072836B - Transparency electromagnetic wave shield box based on graphene and indium tin oxide films - Google Patents
Transparency electromagnetic wave shield box based on graphene and indium tin oxide films Download PDFInfo
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- CN105072836B CN105072836B CN201510507927.9A CN201510507927A CN105072836B CN 105072836 B CN105072836 B CN 105072836B CN 201510507927 A CN201510507927 A CN 201510507927A CN 105072836 B CN105072836 B CN 105072836B
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Abstract
The invention discloses a kind of transparency electromagnetic wave shield box based on graphene and indium tin oxide films, mainly solve existing metal electromagnetic shielding box and produce intracavitary resonance in specific frequency, influence interference shielding box in radio circuit work and it is opaque, be unfavorable for monitor internal circuit the problem of.It includes transparent cartridge (1) and can bottom (2), and the radio circuit for needing to be electromagnetically shielded is placed on can bottom (2), and box body (1) is fixed on can bottom (2).Indium tin oxide films (3) are posted in its outer surface of box body, for shielding extraneous electromagnetic signals；Its inner surface posts graphene film (4), in absorption cell body as radio circuit and box body interaction caused by self-resonance energy.The present invention can be effectively isolated to shielding box inside and outside electromagnetic signal and internal resonant energy is effectively suppressed, and realize the real-time monitoring to circuit in box, and available for integrated antenna package, electromagnetism is anti-interference and testing weak signals system.
Description
Technical field
The invention belongs to radio frequency and microwave electromagnetic compatible technique field, box is more particularly to electromagnetically shielded, available for integrated electricity
Road encapsulates, electromagnetism is anti-interference and testing weak signals system.
Background technology
Graphene is a kind of two dimensional surface carbon atom thin-film material, has monoatomic layer thickness, mechanical hardness height, carrier
The features such as mobility is high, pliability and translucency are good, electrical conductivity is adjustable, can be used to design various novel nano devices or
Person's transparent conductive material, such as transparency electrode, optical modulator, polarizer, plasma device, photon detector, super prism and suction
Wave device etc..Tin indium oxide is the semiconductor film membrane material being processed on flexible material using a variety of methods such as sputtering, evaporations
Material, has the characteristics that transparent, conductance is high, light transmittance is high, mechanical hardness is high and chemical stability is good.Traditional electromagnetic shielding box
It is a kind of metal case of closing, the electromagnetic signal inside and outside box body is isolated, makes internal electromagnetic signal from external interference
And influence, so as to realize the reliable and stable of work.
2006, Zhang Bowen et al. existed《Semiconductor technology》Periodical is delivered on the 6th phase of volume 31《Film resistance is as microwave
Circuit package mode of resonance inhibition layer》, it is proposed that the top layer in metal shielding box increases by one layer of medium and thin film resistance
Structure design integrated circuit shielding box, shielding box internal resonance energy is absorbed, prevent disturb the normal work of integrated circuit
Make.But it is not ideal enough to the inhibition of box body mode of resonance, and box body is nontransparent, the person of being not convenient to use is observed in shielding box
Portion's structure and working condition.
The content of the invention
It is an object of the invention in view of the deficienciess of the prior art, proposing a kind of thin based on graphene and tin indium oxide
The transparency electromagnetic wave shield box of film, while external electromagnetic interference is shielded, absorb shielding box inside by radio circuit component with
Mode of resonance energy caused by box body effect, the radio circuit inside guard shield box is from external electromagnetic environment and internal resonance
Influence.
To achieve the above object, transparency electromagnetic wave shield box provided by the invention includes box body and can bottom, can bottom
Upper to place the radio circuit for needing to be electromagnetically shielded, box body is fixed on can bottom, it is characterised in that：
It is thin that transparent indium tin oxide of the surface resistivity between 1 Ω/sq -10 Ω/sq is posted in its outer surface of the box body
Film, for shielding extraneous electromagnetic signals；It is saturating between 200 Ω/sq -1000 Ω/sq that its inner surface posts surface resistivity
Bright graphene film, in absorption cell body as radio circuit and box body interaction caused by resonant energy.
Further, box body is used by thickness in 0.5mm between 10mm, and relative dielectric constant is transparent between 1 to 10
The hollow cuboid that dielectric material is formed.
Further, box body is used by thickness in 0.5mm between 10mm, and relative dielectric constant is transparent between 1 to 10
The hollow hemisphere that dielectric material is formed.
Further, the shapes and sizes at can bottom are identical with the shapes and sizes of box body bottom opening, for for need
The radio circuit of electromagnetic shielding provides ground connection.
The present invention has following technological merit：
1. the present invention has high saturating due to the transparent indium tin oxide film of the outer application high conductivity in transparent medium box
The electro-magnetic screen function of photosensitiveness, it is possible to achieve internal and extraneous electromagnetic signals are effectively isolated；
2. the present invention in the inner side of transparent medium box due to, coated with the transparent graphene film consumed, having high light transmittance
Electromagnetic wave absorption function, it is possible to achieve carry out effectively absorbing and suppressing to internal resonant energy.
3. the present invention can be realized to shielding box because cartridge uses translucent material in the case of shielding box is not opened
The real-time monitoring of internal circuit or system.
Brief description of the drawings
Fig. 1 is the rectangular parallelepiped structure schematic diagram of the present invention；
Fig. 2 is the diagrammatic cross-section of the rectangular parallelepiped structure of the present invention；
Fig. 3 is the hemisphere structural representation of the present invention；
Fig. 4 is the diagrammatic cross-section of the hemisphere structure of the present invention；
Fig. 5 is square structure of the present invention and existing square metal shielding box effect contrast figure；
Fig. 6 is hemispherical dome structure of the present invention and existing hemispherical metal shielding box effect contrast figure.
Embodiment
Embodiments of the invention and effect are described in further detail below in conjunction with the accompanying drawings：
Embodiment 1：Dielectric material thickness is the 1.7mm rectangular body electromagnetic shielding box of quartz-glass hollow.
Reference picture 1, this example include quadrangle box 1 and square metal cassette bottom 2, and being placed in square metal cassette bottom 2 needs electricity
The radio circuit of magnetic screen, quadrangle box 1 are fixed in square metal cassette bottom 2.Wherein：
The material selection thickness of the quadrangle box 1 is 1.7mm, and relative dielectric constant is 3.78 quartz glass, is formed
Hollow rectangular parallelepiped structure, the radio frequency that the length of quadrangle box 1 needs to be electromagnetically shielded according to being placed in square metal cassette bottom 2
Fixed element height is determined in the size and circuit board of circuit board, i.e., the radio frequency circuit board that ensure to need to be electromagnetically shielded can be put
Put in quadrangle box 1.
Reference picture 2, to reduce harmful effect caused by the radio circuit placed in external electromagnetic environment square shaped box body 1,
The present invention is pasted with the indium tin oxide films 3 that surface resistivity is 2 Ω/sq in the outer surface of box body 1, due to indium tin oxide films
3 have a higher electrical conductivity, and major part energy will be reflected during electromagnetic wave approach indium tin oxide films 3, only extremely least a portion of
Electromagnetic wave energy can penetrate indium tin oxide films 3 and be transferred in quadrangle box 1, therefore, will be played by indium tin oxide films 3
Effect to outside ELECTROMAGNETIC RADIATION SHIELDING.
Simultaneously because the indium oxide selenium film 3 that surface resistivity is 2 Ω/sq has been attached in the outer surface of quadrangle box 1, and with
Square metal cassette bottom 2 together form a kind of microwave cavity, and its resonant frequency depends on equation below：
Wherein c be vacuum in the light velocity, μrFor intracavitary equivalent permeability, εrFor intracavitary equivalent relative dielectric constant, a, b, l
The respectively length of box body 1, m, n, p are respectively microwave cavity that quadrangle box 1 is formed on length direction
Half-wavelength number.Strong resonant energy is produced in these Frequency points, quadrangle box 1, is positioned over penetrating in quadrangle box 1
Electromagnetic interference between frequency circuit component most serious at this moment, causes the radio circuit can not normal work.So must be
The inner surface of quadrangle box 1 adheres to absorbing material, absorbs resonant energy strong caused by the inside of quadrangle box 1, ensures rectangular box
The normal work for the radio circuit that the inside of body 1 is placed.
Therefore, the present invention is pasted with the graphene film that surface resistivity is 300 Ω/sq in the inner surface of quadrangle box 1
4, because graphene film 4 has higher surface resistivity, when electromagnetic wave incident is in graphene film 4, electromagnetic wave energy
Ohmic loss will be all produced on graphene film；Graphene-medium-tin indium oxide composite construction forms Salisbury simultaneously
Wave absorbing device, the resonant energy as caused by radio circuit component in quadrangle box 1 is set to be absorbed and suppress.Therefore, stone is passed through
Black alkene film 4 will play a part of the absorption of the internal resonance mode of energy of square shaped box body 1.
The size of square metal cassette bottom 2 is identical with the bottom opening size of box body 1, i.e., square metal cassette bottom 2 is intactly covered
The bottom opening of quadrangle box 1 is covered.Because square metal cassette bottom 2 employs metal material, it is set to shield the external world
Influence inside electromagnetic environment square shaped box body 1, moreover it is possible to which the radio circuit to be placed in quadrangle box 1 provides ground connection, and ensureing should
The normal work of radio circuit.
Embodiment 2：Dielectric material thickness is the 1mm hollow rectangular body electromagnetic shielding box of crystal slab.
The structure of this example is same as Example 1, and the material selection thickness of the quadrangle box 1 is 1mm, normal with respect to dielectric
Number is 10 crystal slab, forms hollow rectangular parallelepiped structure,
This example is pasted with the indium tin oxide films 3 that surface resistivity is 10 Ω/sq in the outer surface of quadrangle box 1,
The inner surface of quadrangle box 1 is pasted with the graphene film 4 that surface resistivity is 200 Ω/sq.
Embodiment 3：Dielectric material thickness is 10mm polyethylene terephthalate (PET) hollow hemisphere electromagnetic screen
Cover box.
Reference picture 3, this example include hemispherical box body 1 and circular metal cassette bottom 2, and being placed in circular metal cassette bottom 2 needs
The radio circuit of electromagnetic shielding, hemispherical box body 1 are fixed in circular metal cassette bottom 2, wherein：
The material selection thickness of hemispherical box body 1 is 10mm, and relative dielectric constant is 3.9 polyethylene terephthalate
Ester (PET), hollow hemisphere structure is formed,
Reference picture 4, this example are pasted with the tin indium oxide that surface resistivity is 1 Ω/sq in the outer surface of hemispherical box body 1
Film 3, the graphene film 4 that surface resistivity is 1000 Ω/sq is pasted with the inner surface of hemispherical box body 1.
The size of circular metal cassette bottom 2 is identical with the bottom opening size of hemispherical box body 1, i.e. circular metal cassette bottom
2 intactly cover the bottom opening of box body 1.
The effect of the present invention can be further illustrated by following emulation：
Emulation 1, in the structure of embodiment 1, the exterior surface dimension for taking quadrangle box 1 is 30mm*30mm*10mm, and
Two radiuses are opened as 1.3mm, the center of circle at a distance of 15mm, on 2 centrosymmetric circular hole of can bottom in the bottom of can bottom 2, stretch into
Two a length of 2mm of probe sub-miniature A connector.An a length of 5mm of probe sub-miniature A connector is placed at 5mm outside can bottom,
The electromagnetic shielding and intracavitary resonant energy assimilation effect of shielding box are emulated in HFSS13.0 softwares, and with it is existing square
The electromagnetic shielding and intracavitary resonant energy assimilation effect of metal electromagnetic shielding box are contrasted, as a result as shown in figure 5, in Fig. 5
Abscissa is frequency, and unit GHz, scope is 2GHz -18GHz, and ordinate is to normalize transmission of electromagnetic energy size, unit
For dB, scope is -120dB -0dB.Wherein Fig. 5 (a) is two kinds of structures to the schematic diagram of intracavitary resonant energy assimilation effect, Fig. 5
(b) be two kinds of structures effectiveness schematic diagram.
From Fig. 5 (a), existing square metal electromagnetic shielding box 7.03GHz, 11.08GHz, 15.67GHz,
Resonance occurs at 17.89GHz frequencies, resonance peak is respectively 0dB, -1.03dB, -1.07dB, -1.7dB.The embodiment of the present invention 1
Above-mentioned resonance peak is suppressed to -38.7dB, -30.2dB, -29.7dB, -27.2dB respectively, and produces about -0.2GHz's or so
Frequency deviation, passed from intracavitary outer energy of the visible existing square metal electromagnetic shielding boxes of Fig. 5 (b) in 2GHz -18GHz frequency ranges
The scope of defeated size is -102dB--40dB, the outer energy of intracavitary of the embodiment of the present invention 1 in 2GHz -18GHz frequency ranges
The scope for transmitting size is -120dB--47dB.
By Fig. 5, it could be assumed that, existing square metal electromagnetic shielding box goes out that strong intracavitary can be produced in specific frequency
Resonant energy, the embodiment of the present invention 1 almost entirely absorb to the resonant energy, at the same time, the screen of the embodiment of the present invention 1
The effect for covering external electromagnetic environmental disturbances is equally matched with the effect of existing square metal electromagnetic shielding box.
Emulation 2, in the structure of embodiment 3, the outer radius that takes hemispherical box body 1 be 23.5mm, the arrangement that its SMA pops one's head in
Mode is identical with emulation 1.Electromagnetic shielding and intracavitary resonant energy assimilation effect in HFSS13.0 softwares to shielding box are carried out
Emulation, and contrasted with the electromagnetic shielding of existing hemispherical metal electromagnetic shielding box and intracavitary resonant energy assimilation effect,
As a result as shown in fig. 6, the abscissa in Fig. 6 is frequency, unit GHz, scope is 2GHz -11GHz, and ordinate is normalization
Transmission of electromagnetic energy size, unit dB, scope are -120dB -0dB.Wherein Fig. 6 (a) is two kinds of structures to intracavitary resonance energy
The schematic diagram of assimilation effect is measured, Fig. 6 (b) is the schematic diagram of the effectiveness of two kinds of structures.
From Fig. 6 (a), existing hemispherical metal is electromagnetically shielded box at 5.61GHz, 7.91GHz, 9.22GHz frequency
Generation resonance, resonance peak is respectively -19.8dB, -1.2dB, 0dB, and the embodiment of the present invention 3 presses down above-mentioned resonance peak respectively
Make -57.2dB, -47.8dB, -43.7dB.
From intracavitary external enwergy of the visible existing hemispherical metal electromagnetic shielding boxes of Fig. 6 (b) in 2GHz -11GHz frequency ranges
The scope of amount transmission size is -114dB--83dB, and the embodiment of the present invention 3 is outside the intracavitary in 2GHz -11GHz frequency ranges
The scope of energy transmission size is -107dB--78dB.
By Fig. 6, it could be assumed that, existing hemispherical metal electromagnetic shielding box goes out that strong chamber can be produced in specific frequency
Interior resonance energy, the embodiment of the present invention 3 almost entirely absorb to the resonant energy, at the same time, the embodiment of the present invention 3
The effect for shielding external electromagnetic environmental disturbances is equally matched with the effect of existing hemispherical metal electromagnetic shielding box.
Above-described embodiment is the preferable embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any Spirit Essences without departing from the present invention with made under principle change, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (4)
1. a kind of transparency electromagnetic wave shield box based on graphene and indium tin oxide films, including box body (1) and can bottom (2),
The radio circuit for needing to be electromagnetically shielded is placed on can bottom (2), box body (1) is fixed on can bottom (2), and its feature exists
In：
Post indium tin oxide films of the surface resistivity between 1 Ω/sq -10 Ω/sq in described its outer surface of box body (1)
(3), for shielding extraneous electromagnetic signals；Its inner surface posts surface resistivity between 200 Ω/sq -1000 Ω/sq
Graphene film (4), in absorption cell body as radio circuit and box body (1) interaction caused by self-resonance energy.
2. the transparency electromagnetic wave shield box according to claim 1 based on graphene and indium tin oxide films, it is characterised in that
Box body (1) is used by thickness in 0.5mm between 10mm, and transparent dielectric material of the relative dielectric constant between 1 to 10 is formed
Hollow cuboid.
3. the transparency electromagnetic wave shield box according to claim 1 based on graphene and indium tin oxide films, it is characterised in that
Box body (1) is used by thickness in 0.5mm between 10mm, and transparent dielectric material of the relative dielectric constant between 1 to 10 is formed
Hollow hemisphere.
4. the transparency electromagnetic wave shield box according to claim 1 based on graphene and indium tin oxide films, it is characterised in that
The shapes and sizes at can bottom (2) are identical with the shapes and sizes of box body (1) bottom opening, for needing to be electromagnetically shielded
Radio circuit provides ground connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510507927.9A CN105072836B (en) | 2015-08-18 | 2015-08-18 | Transparency electromagnetic wave shield box based on graphene and indium tin oxide films |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510507927.9A CN105072836B (en) | 2015-08-18 | 2015-08-18 | Transparency electromagnetic wave shield box based on graphene and indium tin oxide films |
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| CN105072836A CN105072836A (en) | 2015-11-18 |
| CN105072836B true CN105072836B (en) | 2018-03-06 |
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| CN113194704B (en) * | 2021-05-10 | 2022-09-27 | 西安电子科技大学 | Method for protecting working circuit in cavity |
Citations (4)
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| CN101289287A (en) * | 2008-03-28 | 2008-10-22 | 杭州钱塘江特种玻璃技术有限公司 | Viewing glass for radio frequency electromagnetic screen and method for preparing same |
| CN101415318A (en) * | 2007-10-19 | 2009-04-22 | 鸿富锦精密工业（深圳）有限公司 | Wireless communication apparatus and electromagnetic shielding device thereof |
| CN103018925A (en) * | 2012-12-13 | 2013-04-03 | 大连理工大学 | Artificial electromagnetic metamaterial with tunable circular dichroism based on topology/graphene material |
| CN103596413A (en) * | 2012-06-14 | 2014-02-19 | 国际商业机器公司 | Graphene based structure and method for broadband electromagnetic radiation absorption at the microwave and terahertz frequencies |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201445410A (en) * | 2013-05-22 | 2014-12-01 | Waltop Int Corp | Electromagnetic induction panel structure and method of manufacturing the same, and electromagnetic handwriting input device |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101415318A (en) * | 2007-10-19 | 2009-04-22 | 鸿富锦精密工业（深圳）有限公司 | Wireless communication apparatus and electromagnetic shielding device thereof |
| CN101289287A (en) * | 2008-03-28 | 2008-10-22 | 杭州钱塘江特种玻璃技术有限公司 | Viewing glass for radio frequency electromagnetic screen and method for preparing same |
| CN103596413A (en) * | 2012-06-14 | 2014-02-19 | 国际商业机器公司 | Graphene based structure and method for broadband electromagnetic radiation absorption at the microwave and terahertz frequencies |
| CN103018925A (en) * | 2012-12-13 | 2013-04-03 | 大连理工大学 | Artificial electromagnetic metamaterial with tunable circular dichroism based on topology/graphene material |
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